CN117175976A - Motor driver with high success rate starting mechanism - Google Patents

Motor driver with high success rate starting mechanism Download PDF

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Publication number
CN117175976A
CN117175976A CN202210622424.6A CN202210622424A CN117175976A CN 117175976 A CN117175976 A CN 117175976A CN 202210622424 A CN202210622424 A CN 202210622424A CN 117175976 A CN117175976 A CN 117175976A
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CN
China
Prior art keywords
motor
signal
slope
waveforms
circuit
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CN202210622424.6A
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Chinese (zh)
Inventor
蔡明融
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Anpec Electronics Corp
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Anpec Electronics Corp
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Publication of CN117175976A publication Critical patent/CN117175976A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/20—Arrangements for starting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2209/00—Indexing scheme relating to controlling arrangements characterised by the waveform of the supplied voltage or current
    • H02P2209/07—Trapezoidal waveform
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2209/00—Indexing scheme relating to controlling arrangements characterised by the waveform of the supplied voltage or current
    • H02P2209/11—Sinusoidal waveform
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2209/00—Indexing scheme relating to controlling arrangements characterised by the waveform of the supplied voltage or current
    • H02P2209/13—Different type of waveforms depending on the mode of operation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electric Motors In General (AREA)
  • Motor And Converter Starters (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The invention discloses a motor driver with a high-success-rate starting mechanism. The multi-stage slope pattern circuit connects the values of the waveforms of the start waveform signal to form a curve. The multi-slope pattern circuit determines a plurality of slopes of a plurality of curve segments included in the curve according to a plurality of parameters related to the motor. The multi-slope pattern circuit outputs a multi-slope pattern signal according to the slopes of the plurality of curve segments. The start signal generating circuit outputs a first start waveform signal according to the multi-stage slope pattern signal. The motor control circuit controls the motor driving circuit to start the motor according to the first starting waveform signal.

Description

Motor driver with high success rate starting mechanism
Technical Field
The present invention relates to motors, and more particularly, to a motor driver with a high-success-rate start mechanism.
Background
In an electronic device, a motor of a fan is used to cool a heat generating component such as a processor. In the process of cooling the heat generating component by the motor of the fan, the data related to the motor needs to be acquired in real time, so that the rotating speed of the motor of the fan can be accurately controlled according to the data, the fan Ma Dabiao can exhibit the most proper cooling performance, and the heat generating component can be properly cooled.
However, the conventional motor driver fixedly outputs a start signal having the same waveform to the motor every time the motor is started. The wave crest values of a plurality of wave forms of the wave form of the starting signal are connected with each other to form a curve. The curve of this start signal always remains with only the same slope. As a result, when the target rotation speed of the motor is low, there is a possibility that the rotation speed after the motor is started may be overshot. The conventional motor driver has a low success rate of starting the motor and successfully starting the motor in real time, and may not be able to rapidly increase the rotational speed of the motor to a target rotational speed, and simultaneously cause unnecessary energy waste in the process of starting the motor and driving the motor to normally operate.
Disclosure of Invention
The invention aims to solve the technical problem of providing a motor driver with a high-success-rate starting mechanism, which is suitable for starting motor operation in a motor starting time interval. The motor driver with the high-success-rate starting mechanism comprises a multi-stage slope pattern circuit, a starting signal generating circuit, a motor control circuit and a motor driving circuit. The multi-stage slope pattern circuit is configured to divide a motor start time interval into a plurality of motor start times according to a plurality of parameters related to the motor. The multi-stage slope pattern circuit is configured to interconnect a plurality of values of a plurality of waveforms respectively during a motor start-up time interval to form a curve. The curve includes a plurality of curve segments each over a plurality of motor start times.
The multi-section slope pattern circuit is configured to determine a plurality of slopes of the plurality of curve segments according to a plurality of parameters related to the motor, and output a multi-section slope pattern signal according to the plurality of slopes of the plurality of curve segments. The slope of the curve segment during each motor start time is different from the slope of the curve segments during the other motor start times. And the starting signal generating circuit is connected with the multi-section slope pattern circuit and is configured to output a first starting waveform signal according to the multi-section slope pattern signal. The motor control circuit is connected with the starting signal generating circuit. The motor control circuit is configured to output a motor control signal according to the first start waveform signal. The motor driving circuit is connected with the motor control circuit and the motor. The motor driving circuit is configured to output a motor starting signal to the motor to start the motor according to the motor control signal.
In an embodiment, the multi-segment slope pattern circuit divides the motor start time interval into a first motor start time and a second motor start time comprised by the plurality of motor start times.
In an embodiment, the multi-segment slope pattern circuit divides the motor start time interval into a first motor start time, a second motor start time, a third motor start time, and a fourth motor start time comprised of a plurality of motor start times.
In an embodiment, the multi-stage slope pattern circuit connects a plurality of peak values of a plurality of waveforms of the first start waveform signal to each other to form a curve.
In an embodiment, the multi-segment slope pattern circuit connects a plurality of valley values of a plurality of waveforms of the first start waveform signal to each other to form a curve.
In an embodiment, the slope of the curve segment during one of the motor start times that occurs earliest among the plurality of motor start times is smaller than the slope of the curve segment during each of the other later motor start times.
In an embodiment, the multi-stage slope pattern circuit determines the number of motor start-up times and the time length of each motor start-up time divided by the motor start-up time interval according to a plurality of parameters related to the motor.
In an embodiment, the plurality of parameters includes a size, a weight, a static friction force experienced by the motor at start-up, a target rotational speed of the motor, or any combination thereof.
In an embodiment, the multi-segment slope pattern circuit stores a plurality of start slope patterns. Each start slope pattern includes a plurality of sub slope pattern segments. The multi-section slope pattern circuit selects one of the starting slope patterns according to a plurality of parameters related to the motor, and determines that the slopes of a plurality of curve sections respectively within a plurality of motor starting times are respectively equal to the slopes of a plurality of sub-slope pattern sections of the selected starting slope pattern.
In one embodiment, the motor driver with high-power start mechanism further comprises an initial waveform amplitude determining circuit. The initial waveform amplitude determining circuit is connected with the start signal generating circuit. The initial waveform amplitude determining circuit is configured to determine one or more of a plurality of waveforms of a first start waveform signal when the motor is initially started according to a plurality of parameters related to the motor, so as to output an initial waveform amplitude signal. The start signal generating circuit outputs a first start waveform signal according to the initial waveform amplitude signal and the multi-stage slope pattern signal.
In an embodiment, the initial waveform amplitude determining circuit determines that the amplitude of one or more of the plurality of waveforms of the first start waveform signal is greater as the static friction force experienced by the motor at start-up is greater as the plurality of parameters associated with the motor include.
In an embodiment, the plurality of waveforms of the first start-up waveform signal includes a plurality of sine wave waveforms, a plurality of third harmonic waveforms, or a combination thereof.
In an embodiment, the motor control circuit compares a plurality of values of the first start waveform signal and the second start waveform signal to determine a level of the motor control signal, and further determines a plurality of duty cycles of the plurality of waveforms of the motor control signal, respectively.
In an embodiment, the plurality of waveforms of the second start waveform signal comprise a plurality of triangular waveforms, a plurality of sawtooth waveforms, or a combination thereof.
As described above, the present invention provides a motor driver with a high success rate starting mechanism, which has the following characteristics:
a high success rate of starting can be achieved for fan motors of different characteristics (e.g. subjected to different static friction).
The amplitudes of a plurality of waveforms of a first starting waveform signal for starting the motor are improved so as to provide higher driving force for the fan motor in a short time, thereby realizing the requirement of quickly reaching the rotating speed required by a customer.
The curve formed by connecting the peak values of the waveforms of the first starting waveform signal for starting the motor has a multi-stage slope, can provide the optimal starting driving force according to different fans, and can provide corresponding slope no matter the static friction force in the front stage or different acceleration areas in the rear stage, so that the fan motor is started to have lower vibration noise.
For a further understanding of the nature and the technical aspects of the present invention, reference should be made to the following detailed description of the invention and the accompanying drawings, which are provided for purposes of reference only and are not intended to limit the invention.
Drawings
Fig. 1 is a block diagram of a motor driver with a high-success-rate start mechanism according to an embodiment of the present invention.
Fig. 2 is a waveform diagram of signals of a motor driver with a high-success-rate start mechanism according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a curve formed by connecting wave crests of a plurality of waveforms of a signal of a motor driver with a high-success-rate starting mechanism with a plurality of slopes according to an embodiment of the present invention.
Fig. 4 is a waveform diagram of signals of a motor driver with a high-success-rate start mechanism according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a curve formed by connecting wave crest values of a plurality of waveforms of a signal of a motor driver with a high-success-rate starting mechanism with a plurality of slopes according to an embodiment of the present invention.
Fig. 6 is a waveform diagram of signals of a motor driver with a high-success-rate start mechanism according to an embodiment of the present invention.
Fig. 7 is a waveform diagram of signals of a motor driver with a high-success-rate start mechanism according to an embodiment of the present invention.
Fig. 8 is a waveform diagram of signals of a motor driver with a high-success-rate start mechanism according to an embodiment of the present invention.
Detailed Description
The following embodiments of the present invention are described in terms of specific examples, and those skilled in the art will appreciate the advantages and effects of the present invention from the disclosure herein. The invention is capable of other and different embodiments and its several details are capable of modification and variation in various respects, all from the point of view and application, all without departing from the spirit of the present invention. The drawings of the present invention are merely schematic illustrations, and are not intended to be drawn to actual dimensions. The following embodiments will further illustrate the related art content of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention. In addition, the term "or" as used herein shall be taken to include any one or a combination of more of the associated listed items as the case may be.
Referring to fig. 1 to 3, fig. 1 is a block diagram of a motor driver with a high-success-rate start mechanism according to an embodiment of the present invention, and fig. 2 is a waveform diagram of signals of the motor driver with the high-success-rate start mechanism according to an embodiment of the present invention; fig. 3 is a schematic diagram of a curve formed by connecting wave crests of a plurality of waveforms of a signal of a motor driver with a high-success-rate starting mechanism with a plurality of slopes according to an embodiment of the present invention.
The motor driver according to the embodiment of the present invention may include a multi-stage slope pattern circuit 20, a start signal generating circuit 30, a motor control circuit 40 and a motor driving circuit 50 as shown in fig. 1, for starting the motor MT, so that the rotation speed of the motor MT after being started reaches the target rotation speed rapidly.
As shown in fig. 1, the multi-segment slope pattern circuit 20 may be connected to a start signal generation circuit 30. The motor control circuit 40 may be connected to the start signal generation circuit 30 and the motor drive circuit 50. The motor driving circuit 50 may be connected to a motor MT such as a three-phase motor.
Before the motor MT is started, the multi-stage slope pattern circuit 20 may divide a motor start time interval into a plurality of motor start times. The motor driver according to the embodiment of the present invention can perform different driving operations on the motor MT during different motor start-up times.
First, the multi-stage slope pattern circuit 20 can determine the number of motor start-up times and the time length of each motor start-up time according to a plurality of parameters related to the motor MT. In the present embodiment, the parameters related to the motor MT include, but are not limited to, static friction force, weight, size, and target rotation speed of the motor MT, which are born by the motor MT when the motor MT is started.
For example, the multi-stage slope pattern circuit 20 divides a motor start time interval into two motor start times, such as the first motor start time TRN1 and the second motor start time TRN2 shown in fig. 2, which is only illustrative and not limiting. The first motor start time TRN1 is the earliest motor start time, and the second motor start time TRN2 is the next time later than the first motor start time TRN 1.
The multi-stage slope pattern circuit 20 may be connected to form a curve by a plurality of (voltage or current) values of the waveforms of the first start-up waveform signal WS1 within a motor start-up time interval (including the first motor start-up time TRN1 and the second motor start-up time TRN 2). The curve includes a plurality of curve segments, such as the first curve segment SL11 and the second curve segment SL12 shown in fig. 2, within the first motor start time TRN1 and the second motor start time TRN2, respectively.
The multi-slope pattern circuit 20 can determine the slope of the first curve segment SL11 and the slope of the second curve segment SL12 as shown in fig. 2 and 3 according to a plurality of parameters related to the motor, thereby determining the amplitudes (e.g., 20%) of the waveforms forming the first curve segment SL11 and the amplitudes (e.g., 20% -100%) of the waveforms forming the second curve segment SL 12. The slope of the second curve segment SL12 is different from the slope of the first curve segment SL 11. Finally, the multi-slope pattern circuit 20 can output a multi-slope pattern signal according to the slope of the first curve segment SL11 and the slope of the second curve segment SL 12.
For example, the multi-slope pattern circuit 20 can determine the slope of the first curve segment SL11 according to the static friction force applied by the motor MT during the start. After the motor MT overcomes the static friction, the second motor start time TRN2 is entered. The multi-slope pattern circuit 20 can determine the slope of the second curve segment SL12 according to the target rotation speed of the motor MT.
The slope of the curve segment (e.g., the first curve segment SL11 at the first motor start time TRN 1) in the earliest occurrence of the plurality of motor start times sliced in the motor start time interval may be smaller than the slope of the curve segment (e.g., the second curve segment SL12 at the second motor start time TRN 2) in the other later motor start times.
If desired, the multi-segment slope pattern circuit 20 may store a plurality of start-up slope patterns. Each start slope pattern may include a plurality of sub slope pattern segments for driving the motor MT at a plurality of motor start times, respectively. The plurality of sub-slope pattern segments may include at least a first sub-slope pattern segment and a second sub-slope pattern segment. In practice, the plurality of sub-slope pattern segments may include more than two sub-slope pattern segments.
The multi-slope pattern circuit 20 can select one of the plurality of start slope patterns according to a plurality of parameters related to the motor MT, and determine that a plurality of slopes of a plurality of curve segments of the first start waveform signal WS1 during a plurality of motor start times are respectively equal to a plurality of slopes of a plurality of sub-slope pattern segments included in the selected one of the plurality of start slope patterns, so as to output a multi-slope pattern signal.
For example, the slope of the first curve segment SL11 of the first start waveform signal WS1 may be the same as the slope of the first sub-slope pattern segment, and the slope of the second curve segment SL12 of the first start waveform signal WS1 may be the same as the slope of the second sub-slope pattern segment.
The start signal generating circuit 30 may output the first start waveform signal WS1 according to a multi-stage slope pattern signal received from the multi-stage slope pattern circuit 20. Then, the motor control circuit 40 may output a motor control signal according to the first start waveform signal WS1 received from the start signal generating circuit 30. Finally, the motor driving circuit 50 can output a motor start signal to the motor MT to start the motor MT according to the motor control signal received from the motor control circuit 40.
Referring to fig. 1, fig. 4 and fig. 5, fig. 1 is a block diagram of a motor driver with a high-success-rate start mechanism according to an embodiment of the present invention, fig. 4 is a waveform diagram of a signal of the motor driver with the high-success-rate start mechanism according to an embodiment of the present invention, and fig. 5 is a schematic diagram of a curve formed by connecting a plurality of wave peaks of a plurality of wave forms of the signal of the motor driver with the high-success-rate start mechanism according to an embodiment of the present invention.
In the motor driver of the present embodiment, during each start of the motor MT, the number and the slope of the plurality of curve segments included in the curve formed by connecting the values of the plurality of waveforms of the first start waveform signal WS1 for starting the motor MT in different time intervals can be adjusted. For example, the motor driver of the present embodiment just starts the first start waveform signal WS1 for starting the motor MT as shown in fig. 2, and finally starts the first start waveform signal WS1 for starting the motor MT as shown in fig. 4.
The multi-segment slope pattern circuit 20 shown in fig. 1 may segment a motor start time interval into more motor start times, such as, but not limited to, a first motor start time TRN1, a second motor start time TRN2, a third motor start time TRN3, and a fourth motor start time TRN4 as shown in fig. 4.
The multi-stage slope pattern circuit 20 can connect a plurality of peak values of a plurality of waveforms of the first start waveform signal WS1 in a motor start time interval to form a curve SC as shown in fig. 4. The curve SC includes a first curve segment ST11, a second curve segment ST12, a third curve segment ST13, and a fourth curve segment ST14 as shown in fig. 4 and 5, within a first motor start time TRN1, a second motor start time TRN2, a third motor start time TRN3, and a fourth motor start time TRN4, respectively.
It is noted that the slopes of the first curve segment ST11, the second curve segment ST12, the third curve segment ST13, and the fourth curve segment ST14 are different from each other.
If necessary, the multi-stage slope pattern circuit 20 can connect the plurality of valley values of the waveforms of the first start waveform signal WS1 in the motor start time interval to form a curve SV as shown in fig. 4. The curve SV comprises a plurality of curve segments having different slopes from each other. The multi-slope pattern circuit 20 can determine the respective slopes of the plurality of curve segments of the curve SV according to the plurality of parameters of the motor MT.
The initial waveform amplitude determining circuit 10 can determine the amplitude of the (first) waveform of the first start waveform signal WS1 within the first motor start time TRN1, for example, 20%, according to the static friction force applied by the motor MT at the start time, so as to output an initial waveform amplitude signal. The multi-stage slope pattern circuit 20 can determine the slope of the first curve segment ST11 within the first motor start time TRN1 according to the static friction force applied during the start of the motor MT, so as to output a multi-stage slope pattern signal.
The multi-stage slope pattern circuit 20 can determine the slope of the second curve segment ST12 within the second motor start time TRN2 according to the target rotation speed of the motor MT, and accordingly determine the amplitude of the waveform of the first start waveform signal WS1 within the second motor start time TRN2, for example, 20% -25%, so as to output the multi-stage slope pattern signal.
The multi-stage slope pattern circuit 20 can determine the slope of the third curve segment ST13 within the third motor start time TRN3 according to the target rotation speed of the motor MT, and accordingly determine the amplitude of the waveform of the first start waveform signal WS1 within the third motor start time TRN3, for example, 25% -35%, so as to output the multi-stage slope pattern signal.
The multi-stage slope pattern circuit 20 can determine the slope of the fourth curve segment ST14 within the fourth motor start time TRN4 according to the target rotation speed of the motor MT, and accordingly determine the amplitude of the waveform of the first start waveform signal WS1 within the fourth motor start time TRN4, for example, 35% -100%, so as to output the multi-stage slope pattern signal.
The start signal generating circuit 30 can output the first start waveform signal WS1 according to the initial waveform amplitude signal and the multi-stage slope pattern signal. The motor control circuit 40 can output a motor control signal according to the first start waveform signal WS1. The motor driving circuit 50 can output a motor start signal to the motor MT according to the motor control signal to start the motor MT.
In detail, the motor MT is allowed to overcome the static friction force during the first motor start time TRN 1. Then, the slow start motor MT starts within the second motor start time TRN2. Then, in the third motor start time TRN3, the slope of the third curve segment ST13 is larger than the slope of the second curve segment ST12, and the rotation speed of the motor MT is accelerated. Then, during the fourth motor start time TRN4, the slope of the fourth curve segment ST14 is larger than the slope of the third curve segment ST13, so that the motor MT is operated more rapidly. Finally, when the rotational speed of the motor MT reaches the target rotational speed, the drive motor MT is maintained to be stably operated at the target rotational speed.
Referring to fig. 1, 6 and 7, fig. 6 is a waveform diagram of signals of a motor driver with a high-success-rate starting mechanism according to an embodiment of the invention; fig. 7 is a waveform diagram of signals of a motor driver with a high-success-rate start mechanism according to an embodiment of the present invention.
The motor driver according to the embodiment of the present invention may further include an initial waveform amplitude determining circuit 10 as shown in fig. 1. As shown in fig. 1, the initial waveform amplitude determination circuit 10 may be connected to a start signal generation circuit 30.
The initial waveform amplitude determining circuit 10 may determine the amplitude of the first waveform (and other waveforms) of the first start waveform signal for initially starting the motor MT according to the magnitude of the static friction force received when the motor MT is started.
When the static friction force received at the time of starting the motor MT is large, the initial waveform amplitude determination circuit 10 determines that the amplitude of the (first) waveform of the first start waveform signal WS2 output from the start signal generation circuit 30 as shown in fig. 6 is large.
In contrast, when the static friction force to which the motor MT is subjected at the time of starting is small, the initial waveform amplitude determination circuit 10 determines that the amplitude of the (first) waveform of the first start waveform signal WS3 as shown in fig. 7 is small, which is output from the start signal generation circuit 30.
If desired, the initial waveform amplitude determination circuit 10 may store a plurality of first reference amplitudes and a plurality of second reference amplitudes. The first plurality of reference amplitudes are respectively greater than the second plurality of reference amplitudes.
When a parameter related to the motor MT indicates that the static friction force born by the motor MT is greater than a static friction force threshold, the amplitudes of the waveforms of the first start waveform signal WS2 determined by the initial waveform amplitude determining circuit 10 are respectively equal to the first reference amplitudes.
In contrast, when a parameter related to the motor MT indicates that the static friction force born by the motor MT at the time of starting is not greater than the static friction force threshold, the amplitudes of the waveforms of the first start waveform signal WS3 determined by the initial waveform amplitude determining circuit 10 are respectively equal to the second reference amplitudes.
Referring to fig. 1 and 8, fig. 1 is a block diagram of a motor driver with a high-success-rate start mechanism according to an embodiment of the invention, and fig. 8 is a waveform diagram of signals of the motor driver with the high-success-rate start mechanism according to an embodiment of the invention.
The start-up signal generation circuit 30 shown in fig. 1 may generate a first start-up waveform signal, such as the first start-up waveform signal WS1 having a plurality of sine wave waveforms shown in fig. 2 and 4, the first start-up waveform signal WS22 having a plurality of sine wave waveforms shown in fig. 8, or the first start-up waveform signal WS21 having a plurality of third harmonic waveforms shown in fig. 8.
In addition, the start-up signal generation circuit 30 shown in fig. 1 may generate a second start-up waveform signal, for example, a second start-up waveform signal TRS having a plurality of triangular waveforms shown in fig. 8. In practice, the waveform of the second start waveform signal TRS may be a sawtooth waveform or other waveform.
The motor control circuit 40 can output a plurality of motor control signals WLS, ULS, VLS to the motor driving circuit 50 (the control terminals of the plurality of switch components of the bridge circuit) respectively according to the first start waveform signal (and the second start waveform signal) to control the motor driving circuit 50 to start the motor MT. The on-time of these switching components depends on the duty cycle of the motor control signal WLS, ULS, VLS.
In detail, the motor control circuit 40 can compare the values of the first start waveform signal and the second start waveform signal to determine the level of a motor control signal WLS, and further determine a plurality of duty cycles of the waveforms of the motor start signal WLS, respectively.
For example, as shown in fig. 8, when the value of the first start waveform signal WS21 is greater than the value of the second start waveform signal TRS, the motor control circuit 40 determines that the motor control signal WLS is at a high level. Conversely, when the value of the first start waveform signal WS21 is smaller than the value of the second start waveform signal TRS, the motor control circuit 40 determines the motor control signal WLS to be at the low level.
In summary, the present invention provides a motor driver with a high success rate starting mechanism, which has the following characteristics:
a high success rate of starting can be achieved for fan motors of different characteristics (e.g. subjected to different static friction).
The amplitude of the waveform of the first starting waveform signal for starting the motor is improved so as to provide higher driving force for the fan motor in a short time, thereby realizing the requirement of rapidly reaching the rotating speed required by a customer.
The curve formed by connecting the peak values of the waveforms of the first starting waveform signal for starting the motor has a multi-stage slope, can provide the optimal starting driving force according to different fans, and can provide corresponding slope no matter the static friction force in the front stage or different acceleration areas in the rear stage, so that the fan motor is started to have lower vibration noise.
The above disclosure is only a preferred embodiment of the present invention and is not limited to the claims, so that all equivalent technical changes made by the specification and drawings of the present invention are included in the claims.

Claims (14)

1. A motor driver with a high-success-rate starting mechanism adapted to start motor operation within a motor starting time interval, the motor driver with a high-success-rate starting mechanism comprising:
a multi-slope pattern circuit configured to segment the motor start time interval into a plurality of motor start times according to a plurality of parameters related to the motor, and to interconnect a plurality of values of a plurality of waveforms respectively in the motor start time interval to form a curve, the curve including a plurality of curve segments respectively in the plurality of motor start times, the multi-slope pattern circuit configured to determine a plurality of slopes of the plurality of curve segments respectively according to the plurality of parameters related to the motor, and to output a multi-slope pattern signal according to the plurality of slopes of the plurality of curve segments respectively, wherein a slope of a curve segment in each motor start time in the plurality of motor start times is different from a slope of a curve segment in each other motor start time;
a start signal generating circuit connected to the multi-segment slope pattern circuit and configured to output a first start waveform signal according to the multi-segment slope pattern signal;
a motor control circuit connected to the start signal generation circuit and configured to output a motor control signal according to the first start waveform signal; and
and the motor driving circuit is connected with the motor control circuit and the motor and is configured to output a motor starting signal to the motor according to the motor control signal so as to start the motor.
2. The motor driver with high-success rate start-up mechanism of claim 1, wherein the multi-segment slope pattern circuit segments the motor start-up time interval into a first motor start-up time and a second motor start-up time comprised by the plurality of motor start-up times.
3. The motor driver with high-success rate start-up mechanism of claim 1, wherein the multi-segment slope pattern circuit segments the motor start-up time interval into a first motor start-up time, a second motor start-up time, a third motor start-up time, and a fourth motor start-up time included in the plurality of motor start-up times.
4. The motor driver with high-power start-up mechanism of claim 1, wherein the multi-segment slope pattern circuit connects a plurality of peak values of the plurality of waveforms of the first start-up waveform signal to each other to form the curve.
5. The motor driver with high-power start-up mechanism of claim 1, wherein the multi-segment slope pattern circuit interconnects a plurality of valley values of the plurality of waveforms of the first start-up waveform signal, respectively, to form the curve.
6. The motor driver with high-success rate start mechanism of claim 1, wherein a slope of a curve segment during one of the plurality of motor start times that occurs earliest is smaller than a slope of a curve segment during other later motor start times.
7. The motor driver with high-power-on mechanism according to claim 1, wherein the multi-slope pattern circuit determines the number of the plurality of motor start-up times and the time length of each of the plurality of motor start-up times divided by the motor start-up time interval according to the plurality of parameters related to the motor.
8. The motor drive with high-success rate start mechanism of claim 1, wherein the plurality of parameters comprises any combination of a size, a weight, a static friction force experienced by the motor at start-up, a target rotational speed of the motor or a size of the motor, the weight, a static friction force experienced by the motor at start-up, a target rotational speed of the motor.
9. The motor driver with high-success rate start-up mechanism of claim 1, wherein the multi-segment slope pattern circuit stores a plurality of start-up slope patterns, each start-up slope pattern comprising a plurality of sub-slope pattern segments, wherein the multi-segment slope pattern circuit selects one of the start-up slope patterns according to the plurality of parameters associated with the motor, and determines that the plurality of slopes of the plurality of curve segments respectively within the plurality of motor start-up times are respectively equal to the slopes of the plurality of sub-slope pattern segments of the selected start-up slope pattern.
10. The motor driver with high-power starting mechanism according to claim 1, further comprising an initial waveform amplitude determining circuit connected to the starting signal generating circuit and configured to determine an amplitude of one or more of the plurality of waveforms of the first starting waveform signal when the motor is initially started according to the plurality of parameters related to the motor, so as to output an initial waveform amplitude signal; the starting signal generating circuit outputs the first starting waveform signal according to the initial waveform amplitude signal and the multi-section slope pattern signal.
11. The motor driver with high-success rate start mechanism of claim 10, wherein the initial waveform amplitude determination circuit determines that the amplitude of one or more of the plurality of waveforms of the first start-up waveform signal is greater as the static friction force experienced by the motor at start-up is greater as the plurality of parameters associated with the motor are included.
12. The motor driver with high-success rate start mechanism of claim 1, wherein the plurality of waveforms of the first start waveform signal comprises a plurality of sine wave waveforms, a plurality of third harmonic waveforms, or a combination of the plurality of sine wave waveforms and the plurality of third harmonic waveforms.
13. The motor driver with high-power-on mechanism according to claim 1, wherein the motor control circuit compares a plurality of values of the first and second start waveform signals to determine a level of the motor control signal, and thereby determines a plurality of duty cycles of the plurality of waveforms of the motor control signal, respectively.
14. The motor driver with high-success rate start mechanism of claim 13, wherein the plurality of waveforms of the second start waveform signal comprises a plurality of triangular waveforms, a plurality of sawtooth waveforms, or a combination of the plurality of triangular waveforms and the plurality of sawtooth waveforms.
CN202210622424.6A 2022-05-25 2022-06-02 Motor driver with high success rate starting mechanism Pending CN117175976A (en)

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JP3993502B2 (en) * 2002-10-21 2007-10-17 株式会社ルネサステクノロジ Multi-phase DC motor rotation drive control device and start-up method
TWI384748B (en) * 2009-04-03 2013-02-01 Anpec Electronics Corp Driving method and related driving device for a motor
US8633662B2 (en) * 2009-06-12 2014-01-21 Standard Microsystems Corporation Drive method to minimize vibration and acoustics in three phase brushless DC (TPDC) motors
JP5668036B2 (en) * 2012-09-24 2015-02-12 太陽誘電株式会社 Motor drive control device and electric assist vehicle
US11777433B2 (en) * 2018-03-16 2023-10-03 Melexis Bulgaria Ltd. Driver and method for low inductance motor
CN117811424A (en) * 2022-09-26 2024-04-02 茂达电子股份有限公司 Motor driver for setting pulse width modulation in phase change

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